In a message dated 20/07/2005, gcouger@.......... writes:

If you  are recording Audio and use the mixer 


Hi Gordon,
 
    I was using three V/F sine wave converters per  channel and inputting 
this into the digitial recorder as a sum. The three  channels had very different 
centre frequencies and did not overlap.
    Then I took the recorder output, passed it through  three bandpass 
filters and into three PLL detectors, which gave voltage  outputs.
    This was straight FM type recording, no computer  involved at that stage, 
just a box of chips. I was actually recording instrument  signals in a 
glider, so it had to be small and light - airspeed, lift and  sink, altitude and a 
couple of other variables. I started out with a stereo  tape recorder and 
graduated to digital stereo. 
 
    Regards,
 
    Chris Chapman






In a message dated 20/07/2005, gcouger@.......... writes:
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  are recording Audio and use the mixer 

Hi Gordon,
 
    I was using three V/F sine wave converters=
 per=20
channel and inputting this into the digitial recorder as a sum. The three=20
channels had very different centre frequencies and did not overlap.
    Then I took the recorder output, passed it thro=
ugh=20
three bandpass filters and into three PLL detectors, which gave voltage=20
outputs.
    This was straight FM type recording, no compute=
r=20
involved at that stage, just a box of chips. I was actually recording instru=
ment=20
signals in a glider, so it had to be small and light - airspeed, lift and=20
sink, altitude and a couple of other variables. I started out with a st=
ereo=20
tape recorder and graduated to digital stereo. 
 
    Regards,
 
    Chris Chapman